Malicious PDF — malware analysis report

Static analysis result for SHA-256 22aa98a385ddba4f…

MALICIOUS

PDF

40.4 KB Created: 2020-08-29 20:21:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5e6bf095cbcd80e0838c25f713817c0 SHA-1: a16907502087ba5ab0914de89f85949fdc7ee460 SHA-256: 22aa98a385ddba4f4dfc22865b7999526e18cf55445d8c0ed114dbf9ba423c98
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with a critical heuristic firing indicating a malicious redirector. The document body and extracted URLs suggest a lure for downloading software, specifically mentioning 'autodesk inventor 2016 download'. The primary malicious URL identified is ttraff.com, which is flagged as a redirector. The presence of many links to Shopify-hosted PDFs, while some are benign, suggests a link farm or SEO poisoning tactic to increase visibility for the malicious redirector.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/wix?keyword=autodesk+inventor+2016+download
    • https://cdn.shopify.com/s/files/1/0438/1723/8685/files/mojisabatum.pdf
    • https://cdn.shopify.com/s/files/1/0428/3973/6487/files/50197013841.pdf
    • https://cdn.shopify.com/s/files/1/0465/8462/7367/files/ucore_metales_raros_inc_noticiosos_f.pdf
    • https://static.usrfiles.com/ugd/b8c837_3af8dde4ee5e4547b5be98e8cbea9cf0.pdf
    • https://static.usrfiles.com/ugd/4dd980_91e57946b8dd45aaa17866a38ed81edf.pdf
    • https://static.usrfiles.com/ugd/b8c837_68914df9eb4a44ecb18c928ff4647439.pdf
    • https://static.usrfiles.com/ugd/b8c837_3d82a05f57f14d5c905d6675c8c72b8f.pdf
    • https://static.usrfiles.com/ugd/b8c837_e8388d73db444d69a14b93bc18b36f80.pdf
    • https://cdn.shopify.com/s/files/1/0428/4642/1158/files/faithless_drifting_away_piano_sheet_music.pdf
    • https://cdn.shopify.com/s/files/1/0429/3342/0195/files/88401462428.pdf
    • https://cdn.shopify.com/s/files/1/0433/9138/5758/files/80073206077.pdf
    • https://cdn.shopify.com/s/files/1/0439/8094/7614/files/19767253024.pdf
    • https://cdn.shopify.com/s/files/1/0431/5326/0706/files/jivetis.pdf
    • https://cdn.shopify.com/s/files/1/0434/0409/9740/files/aluminum_square_tube_sizes_chart.pdf
    • https://cdn.shopify.com/s/files/1/0449/9403/5880/files/bayesian_statistics_for_hackers.pdf
    • https://cdn.shopify.com/s/files/1/0436/4405/9806/files/tibazikevituxata.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005f6d.bin
5a085843c774868b2098a2143b8d41f7541d5c69404d4118bac5c247c8396686		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F6D 5504 bytes
font_01_sfnt_off0000724d.bin
8003c04e1fd673433991dd5f65806e13feffa27bfc874f76d9b800ad48e60ee2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x724D 10220 bytes

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